android系統信息（內存、cpu、sd卡、電量、版本）獲取

要轉載請註明出處：http://gqdy365.iteye.com/blog/1066113，有很多轉載了文章不寫出處，還寫的是什麼小編最近做項目碰到什麼問題怎麼解決的的然後把文章貼下面，儼然一副他們自己的文章，不知羞恥！
一、內存（ram）：
android的總內存大小信息存放在系統的/proc/meminfo文件裏面，可以通過讀取這個文件來獲取這些信息：

public void getTotalMemory() {
		String str1 = "/proc/meminfo";
		String str2="";
		try {
			FileReader fr = new FileReader(str1);
			BufferedReader localBufferedReader = new BufferedReader(fr, 8192);
			while ((str2 = localBufferedReader.readLine()) != null) {
				Log.i(TAG, "---" + str2);
			}
		} catch (IOException e) {
		}
	}

運行信息如下：

05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---MemTotal:       204876 kB
05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---MemFree:          4596 kB
05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Buffers:         16020 kB
05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Cached:          82508 kB
05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---SwapCached:         64 kB
05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Active:         137104 kB
05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Inactive:        41056 kB
05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---SwapTotal:       65528 kB
05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---SwapFree:        65368 kB
05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Dirty:              88 kB
05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Writeback:           0 kB
05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---AnonPages:       79672 kB
05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Mapped:          38296 kB
05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Slab:             5768 kB
05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---SReclaimable:     1856 kB
05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---SUnreclaim:       3912 kB
05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---PageTables:       8184 kB
05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---NFS_Unstable:        0 kB
05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---Bounce:              0 kB
05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---CommitLimit:    167964 kB
05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---Committed_AS: 11771920 kB
05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocTotal:   761856 kB
05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocUsed:     83656 kB
05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocChunk:   674820 kB

第一行是總內存大小(即用戶可以使用的ram的大小)！其他各項的介紹大家可以看這兒：
http://bg135.com/android-phones-to-get-the-total-memory-and-available-memory.html

獲取當前剩餘內存(ram)大小的方法：

public long getAvailMemory() {
		ActivityManager am = (ActivityManager)mContext.getSystemService(Context.ACTIVITY_SERVICE);
		ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
		am.getMemoryInfo(mi);
		return mi.availMem;
	}

二、Rom大小

public long[] getRomMemroy() {
		long[] romInfo = new long[2];
		//Total rom memory
		romInfo[0] = getTotalInternalMemorySize();

		//Available rom memory
		File path = Environment.getDataDirectory();
		StatFs stat = new StatFs(path.getPath());
		long blockSize = stat.getBlockSize();
		long availableBlocks = stat.getAvailableBlocks();
		romInfo[1] = blockSize * availableBlocks;
		getVersion();
		return romInfo;
	}

	public long getTotalInternalMemorySize() {
		File path = Environment.getDataDirectory();
		StatFs stat = new StatFs(path.getPath());
		long blockSize = stat.getBlockSize();
		long totalBlocks = stat.getBlockCount();
		return totalBlocks * blockSize;
	}

注意類型，不然相乘之後會有溢出。可用內部存儲的大小不能通過getRootDirectory();
取得，之前網上傳的很多都是用getRootDirectory()取得的，我測試之後發現取得的數值不對。要根據getDataDirectory();
取得。

三、sdCard大小

public long[] getSDCardMemory() {
		long[] sdCardInfo=new long[2];
		String state = Environment.getExternalStorageState();
		if (Environment.MEDIA_MOUNTED.equals(state)) {
			File sdcardDir = Environment.getExternalStorageDirectory();
			StatFs sf = new StatFs(sdcardDir.getPath());
			long bSize = sf.getBlockSize();
			long bCount = sf.getBlockCount();
			long availBlocks = sf.getAvailableBlocks();

			sdCardInfo[0] = bSize * bCount;//總大小
			sdCardInfo[1] = bSize * availBlocks;//可用大小
		}
		return sdCardInfo;
	}

注意類型，不然相乘之後會有溢出。

四、電池電量

private BroadcastReceiver batteryReceiver=new BroadcastReceiver(){
		@Override
		public void onReceive(Context context, Intent intent) {
			int level = intent.getIntExtra("level", 0);
			//	level加%就是當前電量了
	}
	};

然後在activity的oncreate()方法中註冊

registerReceiver(batteryReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

五、CPU信息

	public String[] getCpuInfo() {
		String str1 = "/proc/cpuinfo";
		String str2="";
		String[] cpuInfo={"",""};
		String[] arrayOfString;
		try {
			FileReader fr = new FileReader(str1);
			BufferedReader localBufferedReader = new BufferedReader(fr, 8192);
			str2 = localBufferedReader.readLine();
			arrayOfString = str2.split("\\s+");
			for (int i = 2; i < arrayOfString.length; i++) {
				cpuInfo[0] = cpuInfo[0] + arrayOfString[i] + " ";
			}
			str2 = localBufferedReader.readLine();
			arrayOfString = str2.split("\\s+");
			cpuInfo[1] += arrayOfString[2];
			localBufferedReader.close();
		} catch (IOException e) {
		}
		return cpuInfo;
	}

/proc/cpuinfo文件中第一行是CPU的型號，第二行是CPU的頻率，可以通過讀文件，讀取這些數據！

六、系統的版本信息：

	public String[] getVersion(){
		String[] version={"null","null","null","null"};
		String str1 = "/proc/version";
		String str2;
		String[] arrayOfString;
		try {
			FileReader localFileReader = new FileReader(str1);
			BufferedReader localBufferedReader = new BufferedReader(
					localFileReader, 8192);
			str2 = localBufferedReader.readLine();
			arrayOfString = str2.split("\\s+");
			version[0]=arrayOfString[2];//KernelVersion
			localBufferedReader.close();
		} catch (IOException e) {
		}
		version[1] = Build.VERSION.RELEASE;// firmware version
		version[2]=Build.MODEL;//model
		version[3]=Build.DISPLAY;//system version
		return version;
	}

版本信息裏面還包括型號等信息。

七、MAC地址和開機時間：

	public String[] getOtherInfo(){
		String[] other={"null","null"};
        WifiManager wifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        if(wifiInfo.getMacAddress()!=null){
        	other[0]=wifiInfo.getMacAddress();
		} else {
			other[0] = "Fail";
		}
		other[1] = getTimes();
        return other;
	}
	private String getTimes() {
		long ut = SystemClock.elapsedRealtime() / 1000;
		if (ut == 0) {
			ut = 1;
		}
		int m = (int) ((ut / 60) % 60);
		int h = (int) ((ut / 3600));
		return h + " " + mContext.getString(R.string.info_times_hour) + m + " "
				+ mContext.getString(R.string.info_times_minute);
	}

最後貼一個格式化數據的方法：

	public String formatSize(long size) {
		String suffix = null;
		float fSize=0;

		if (size >= 1024) {
			suffix = "KB";
			fSize=size / 1024;
			if (fSize >= 1024) {
				suffix = "MB";
				fSize /= 1024;
			}
			if (fSize >= 1024) {
				suffix = "GB";
				fSize /= 1024;
			}
		} else {
			fSize = size;
		}
		java.text.DecimalFormat df = new java.text.DecimalFormat("#0.00");
		StringBuilder resultBuffer = new StringBuilder(df.format(fSize));
		if (suffix != null)
			resultBuffer.append(suffix);
		return resultBuffer.toString();
	}

保留兩位小數。